The car has a weight of \(4200 \mathrm{lb}\) and a center of gravity at \(G\). Determine the maximum moment created in the side girder at \(C\) as it crosses the bridge. Assume the car can travel in either direction along the center of the deck, so that half its load is transferred to each of the two side girders.

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G B3ft 4 ft 45 ft- 15 ft-